Spectroscopic device and raman spectroscopic system

Abstract

A Raman spectroscopic device includes an optical resonator, in which a first reflecting body that exhibits semi transmissivity/semi reflectivity and has a surface which is a light scattering surface that generates Raman scattering, a transparent body, and a second reflecting body that exhibits reflectivity, are laminated in sequence one on another. The Raman spectroscopic device utilizes light absorption due to resonance to obtain a surface amplified Raman effect.

1. A Raman spectroscopic device for use in Raman spectroscopy, in which a measuring light beam of a particular wavelength is irradiated onto a sample in contact with a light scattering surface, Raman scattered light generated at the light scattering surface is spectrally decomposed, and is employed for detecting a detection target substance in the sample, in the form of an optical resonator, comprising:
 a first reflecting body that exhibits semi transmissivity/semi reflectivity and has a surface which is the light scattering surface for generating Raman scattering; 
 a transparent body; and 
 a second reflecting body that exhibits reflectivity, laminated in sequence one on another; 
 whereby the intensity of the Raman scattered light is amplified by the amplified electric field at the light scattering surface by light absorption, generated by resonance in the optical resonator upon irradiation of the measuring light beam, wherein: 
 the first reflecting body has a structure of protrusions and recesses, which are smaller than the wavelength of the measuring light beam to be irradiated onto the light scattering surface. 
 
     
     
       2. A Raman spectroscopic device as defined in  claim 1 , wherein:
 the first reflecting body is a metal layer formed in a pattern on the surface of the transparent body. 
 
     
     
       3. A Raman spectroscopic device as defined in  claim 1 , wherein
 the first reflecting body is a metal layer comprising a plurality of non-aggregate metal particles which are fixed to the surface of the transparent body. 
 
     
     
       4. A Raman spectroscopic device as defined in  claim 1 , wherein:
 the transparent body is a transparent finely apertured body having a plurality of fine apertures which are open in a surface facing the first reflecting body and of which the diameters are smaller than the wavelength of the measuring light beam in diameter; and 
 the first reflecting body is a metal layer having a plurality of fine apertures along the shape of the surface of the transparent body. 
 
     
     
       5. A Raman spectroscopic device as defined in  claim 4 , wherein:
 the transparent finely apertured body is a metal oxide body obtained by anodic oxidization of a part of a metal body; 
 the second reflecting body is a non anodic oxidized part of the anodic oxidized metal body; and 
 the first reflecting body is a metal layer formed as a film on the transparent body. 
 
     
     
       6. A Raman spectroscopic device as defined in  claim 4 , wherein:
 at least a portion of the plurality of fine apertures of the transparent finely apertured body is filled with metal. 
 
     
     
       7. A Raman spectroscopic device as defined in  claim 6 , wherein:
 the bottoms of the plurality of fine apertures of the transparent finely apertured body are filled with metal. 
 
     
     
       8. A Raman spectroscopic device as defined in  claim 1 , wherein the first reflecting body comprises:
 a metal column structured film having a number of substantially parallel columns extending in a direction not parallel to the surface of the transparent body. 
 
     
     
       9. A Raman spectroscopic device as defined in  claim 1 , wherein the first reflecting body comprises:
 a dielectric column structured film having a number of substantially parallel columns extending in a direction not parallel to the surface of the transparent body; and 
 a metal film formed on the dielectric column structure film. 
 
     
     
       10. A Raman spectroscopic apparatus, comprising:
 a Raman spectroscopic device as defined in  claim 1 ; 
 a light irradiating means for irradiating a measuring light beam of a particular wavelength onto the light scattering surface of the Raman spectroscopic device; and 
 a spectral means for spectrally decomposing the light scattered by the light scattering surface, thereby obtaining the spectrum of Raman scattered light. 
 
     
     
       11. A Raman spectroscopic apparatus as defined in  claim 10 , wherein:
 the spectral means receives and spectrally decomposes only scattered light of non directly reflected components of the measuring light beam scattered at the light scattering surface.